Dan Markel (Florida State) raises the issue, and I basically agree with his take. Two weeks or less to respond to an offer is an exploding offer in my book. One month between time of the faculty vote and a decision is reasonable, assuming of course that a written offer is also producing during that time consistent with discussions. Exploding offers sometimes work, of course, but my guess is that if someone looks empirically at how long recipients of exploding offers remain at a school, they'll find it's less than the average.